Link on "Support" page out of date

[phlummox]

Description

The "Support" page for PyInfra (https://docs.pyinfra.com/en/2.x/support.html) suggests asking queries by "chatting on the pyinfra Discord".

But the welcome message in the Discord forum states it has been deprecated in favour of a Matrix forum, at https://matrix.to/#/%23pyinfra:matrix.org.

p.s. Thanks for all your work on PyInfra!